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# Description This request exposes the prelude::polars::len expression. It is ended for doing fast select count(*) like operations: <img width="626" alt="Screenshot 2024-09-26 at 18 14 45" src="https://github.com/user-attachments/assets/74285fc6-f99c-46e0-9226-9a7d41738d78"> # User-Facing Changes - Introduction of the `polars len` command
Nushell core libraries and plugins
These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.
Foundational libraries are split into two kinds of crates:
- Core crates - those crates that work together to build the Nushell language engine
- Support crates - a set of crates that support the engine with additional features like JSON support, ANSI support, and more.
Plugins are likewise also split into two types:
- Core plugins - plugins that provide part of the default experience of Nu, including access to the system properties, processes, and web-connectivity features.
- Extra plugins - these plugins run a wide range of different capabilities like working with different file types, charting, viewing binary data, and more.